craggers said...
so........
something has been on the back of my mind for years, and never made sense.
i tried to 'skurf' behind a 12hp dinghy once upon a time. it didnt really work, not enough power.
i now see that just "one horse power" is required to tow a person on the plane. so i do realise that in my experiment all those years back there was more mass than just me and the surfboard... there was a tinpot dinghy, a skipper in the dinghy... ok a fuel can, a few beers... the motor itself... surely if we throw in one more horse power for the skipper chap, and another for the other stuff... no make it 2 damn it...
does it not stand to reason that you need no more than say 4 or 5 horsepower on a wee dinghy to get a chap on the plane (on a reasonably chunky surfboard mind you).
so when people tell me they have a boat and i say "woohoo, lets go wakeboarding!!" and they tell me that they only have a 20hp motor... whats that all about???
has the "horsepower" reference lost all relevance to the actual pull a real horse can produce???
i see boats with 200 horsepower. imagine a mob of 200 real live horses, and then imagine harnessing them up to a 20 foot boat.... surely they would tear the fkn thing apart???
or am i ignorant of the difference between 'real output' and 'torque' and 'equine flatulence'....???
anyone got a clue???
The engine may output 200hp at the end of the flywheel. Most of that goes into turbulance around the prop, and water friction on the hull so only a fraction goes into accellerating the boat forward. Thats why a 200hp car can go over 200kph where as a 200hp boat cant.
PS. I can wakeboard behing my 30hp zodiac. Although technically there is no wake, and it gets boring pretty quickly.